More headaches are expected on the afternoon commute with the agency warning of continued poor driving conditions “due to occasional low visibility in heavier snow and accumulating snow on untreated roads.”

Flurries are forecast for Toronto until Sunday.

The snow comes on the heels of a storm that dumped 15 to 25 centimetres of snow in parts of southern Ontario on Saturday that contributed to a calamitous day for TTC riders on Monday.

A series of problems on the TTC caused commuter havoc at multiple subway stations and streetcar stops forcing an extraordinary apology from TTC CEO Andy Byford.

Byford claimed part of the delays were caused by an antiquated communications system on TTC streetcars and buses that was “built in the 1970s,” and promised new budgeted measures would modernize the system.

At 6 a.m., a streetcar derailed leaving the Russell Yard just west of the Beaches. Streetcars could not leave the yard. Once that got moved, streetcars faced a new obstacle: a streetcar broke down at Broadview and Queen.

All over town, commuters waited for streetcars that never came. Normally 17 streetcars operate on Spadina Avenue. The TTC provided just seven Monday. A watermain exploded at Lawrence subway station forcing subways to pass through the station without stopping. Passengers rode shuttle buses. At Dundas and McCaul streets a streetcar hit a car, forcing streetcars to divert. The Bloor-Danforth subway line suffered a track fire at Kennedy Station, and a “safety incident” with subway doors at Donlands station.

Dozens of flights at Pearson Airport were also delayed or cancelled and Toronto’s Billy Bishop island airport ground to a stop on Saturday.